Apples. Sweet cherries. Pears. Blueberries. Sweet corn. One state keeps winning the produce quizzes โ and the secret is a wall of mountains.
The Cascade Mountains split Washington in two. Ocean storms drop their rain on the west side; the east side sits in the rain shadow โ dry, sunny, and perfect for fruit that hates rot and rain-split.
Basis: The Cascade rain shadow is textbook U.S. geography.
Dry air alone isn't enough โ the water comes from rivers and irrigation: snowmelt from the mountains is carried into the orchards of the Columbia Basin, so farmers add exactly as much water as the trees need.
Basis: Columbia Basin irrigation is well documented (and appears in this site's apple quiz background).
Cold winters are actually a feature: apple, cherry and pear trees need winter chill to set fruit properly the next year.
Basis: Fruit-tree chill requirement โ standard horticulture.
๐ Sources for the rankings mentioned in this note (links to the original data and retrieval dates) are on each quiz page below.